Maybe I should re-read Larson's SSRS2008 book, but I'm looking for something that's not super basic. (Well, to be fair, the early stuff in his book is pretty basic, and repetitive as all get out.) I have Lachev's book on 2008 as well, but maybe that's too advanced. (I can follow it, it's just a lot more conceptual than Larson's book.)

Where is a good place/book/website to start really digging into the more complex parts of SSRS? I have 2008R2 and 2012.